Tunneling current through multiple degenerate states of individual quantum dots

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A multilevel Anderson model is employed to simulate the system composed of a quantum dot connected with metallic electrodes. The inhomogenous electron Coulomb interactions in the dot are taken into account in the calculation of tunneling current by the nonequilibrium Green's function technique. In the Coulomb blockade regime, an n-fold degenerate state exhibits the periodic oscillation of n peaks with respect to the gate voltage for homogenous electron Coulomb interaction, but not a periodic structure for inhomogeneous interactions. The well-known staircase behavior arising from not only intraorbital Coulomb interactions but also interorbital interactions is observed in the tunneling current. We also observe the tunneling current showing negative differential conductances instead of bistable current in the attractive interorbital interactions.

Original languageEnglish
Pages (from-to)5358-5361
Number of pages4
JournalJapanese Journal of Applied Physics
Volume47
Issue number7 PART 1
DOIs
StatePublished - 11 Jul 2008

Keywords

  • Degenerate state
  • Negative differential conductance
  • Quantum dots
  • Tunneling current

Fingerprint

Dive into the research topics of 'Tunneling current through multiple degenerate states of individual quantum dots'. Together they form a unique fingerprint.

Cite this